[#EVP_MAC_fetch]
= EVP_MAC_fetch
:mrdocs:

Fetch a MAC algorithm implementation from providers.

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:EVP_MAC.adoc[EVP_MAC]*
EVP_MAC_fetch(
    xref:OSSL_LIB_CTX.adoc[OSSL_LIB_CTX]* libctx,
    char const* algorithm,
    char const* properties);
----

== Return Value

Fetched EVP_MAC (refcount 1), or NULL on error; free with EVP_MAC_free().

== Parameters

[cols="1,4"]
|===
| Name| Description
| *libctx*
| Library context for the fetch, or NULL for the default.
| *algorithm*
| MAC algorithm name (for example "HMAC" or "CMAC").
| *properties*
| Property query string, or NULL.
|===


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